Packaging member

ABSTRACT

A packaging member includes a first partition plate and a second partition plate. The first partition plate has a first slit. The second partition plate has a second slit. The second slit is inserted into the first slit. The first slit includes a one-side cut surface and an other-side cut surface. The one-side cut surface has an engagement protrusion protruding toward the other-side cut surface. The second partition plate has an engagement hole. With the second partition plate inserted in the first slit, the engagement protrusion is inserted into the engagement hole to thereby couple the first partition plate and the second partition plate to each other.

INCORPORATION BY REFERENCE

This application is based on and claims the benefit of priority fromJapanese Patent Application No. 2022-112353 filed on Jul. 13, 2022, thecontents of which are hereby incorporated by reference.

BACKGROUND

The present disclosure relates to a packaging member.

Conventionally, there has been known a packaging member that has apartition plate disposed in a containing area of a packaging box. Bydisposing the partition plate in the containing area of the packagingbox, the containing area can be divided into a plurality of containingareas. For example, in each of the thus obtained plurality of containingareas, a packaged object is contained.

SUMMARY

According to one aspect of the present disclosure, a packaging memberincludes a first partition plate and a second partition plate. The firstpartition plate is disposed in a containing area for containing apackaged object, and extends in a first direction. The second partitionplate is disposed in the containing area, and extends in a seconddirection orthogonal to the first direction. The first partition platehas a first slit cut therein from an end thereof on one side in anup-down direction. The second partition plate has a second slit cuttherein from an end thereof on an other side in the up-down direction.The second slit is inserted into the first slit to thereby couple thefirst partition plate and the second partition plate to each other in anintersecting manner. The first slit includes a one-side cut surface andan other-side cut surface that face each other. The one-side cut surfacehas an engagement protrusion protruding toward the other-side cutsurface. The second partition plate has an engagement hole formedtherein over the second slit, the engagement hole penetrating the secondpartition plate in a plate thickness direction thereof. With the secondpartition plate inserted in the first slit, the engagement protrusion isinserted into the engagement hole to thereby couple the first partitionplate and the second partition plate to each other.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a packaging member according to anembodiment.

FIG. 2 is a plan view of a containing area of the packaging memberaccording to the embodiment as seen from above.

FIG. 3 is a perspective view of a first partition plate and a secondpartition plate of the packaging member according to the embodiment.

FIG. 4 is an enlarged view of and around a first slit formed in thefirst partition plate of the packaging member according to theembodiment.

FIG. 5 is an enlarged view of and around a second slit formed in thesecond partition plate of the packaging member according to theembodiment.

FIG. 6 is a diagram showing a method of fitting the second partitionplate with respect to the first partition plate in the packaging memberaccording to the embodiment.

FIG. 7 is a diagram showing engagement between the first partition plateand the second partition plate of the packaging member according to theembodiment.

FIG. 8 is a development view (a plan view of a cardboard sheet) of thepackaging member according to the embodiment.

FIG. 9 is a diagram showing a state in which part of the cardboard sheetshown in FIG. 8 has been folded.

FIG. 10 is a diagram showing a packaging member according to a modifiedexample.

DETAILED DESCRIPTION

Hereinafter, with reference to FIGS. 1 to 9 , a description will begiven of a packaging member 100 according to an embodiment of thepresent disclosure. In the following description, a direction X in thedrawings is defined as a left-right direction, a direction Y is definedas a front-back direction, and a direction Z is defined as an up-downdirection. The direction X (the left-right direction) corresponds to “asecond direction”, and the direction Y (the front-back direction)corresponds to “a first direction”. Further, in the followingdescription, the meaning of the term “parallel” is not limited to “beingstrictly parallel”, but includes “being substantially parallel”.Further, the meaning of the term “orthogonal” is not limited to “beingstrictly orthogonal”, but includes “being substantially orthogonal”.

<Overall Configuration of Packaging Member>

As shown in FIGS. 1 to 3 , the packaging member 100 of the presentembodiment has a containing area CA in which a packaged object (notshown) is contained. The containing area CA is divided into a pluralityof areas (see FIG. 2 ).

The packaging member 100 includes a first partition plate 1 and a secondpartition plate 2. The packaging member 100 further includes a packagingbox 3. An area inside the packaging box 3 corresponds to the containingarea CA. The first partition plate 1 and the second partition plate 2are disposed in the containing area CA, and divide the containing areaCA into a plurality of areas.

Note that the packaging member 100 is made of a single cardboard sheet100S (see FIG. 8 ). In other words, the single cardboard sheet 100S isfolded int the packaging box 3 integrally having each of the firstpartition plate 1 and the second partition plate 2. In still otherwords, the first partition plate 1 and the second partition plate 2 arenot separate from the packaging box 3. Note that the first partitionplate 1 and the second partition plate 2 each have, as seenindividually, a shape of a plate extending in a direction.

The first partition plate 1 and the second partition plate 2 are fittedtogether to thereby configure a partition plate P as shown in FIG. 3 .In other words, different parts of the single cardboard sheet 100S arefitted together to thereby configure the partition plate P.

<Configuration of Partition Plate>

The first partition plate 1, as seen from a plate-thickness directionthereof, has a structure shown in FIG. 4 . The first partition plate 1has a first slit 11 cut therein from an upper end thereof (i.e., an endthereof on one side in the up-down direction). The first slit 11penetrates the first partition plate 1 in the plate-thickness directionof the first partition plate 1. The first slit 11 extends downward fromthe upper end of the first partition plate 1. However, the first slit 11does not reach a lower end of the first partition plate 1. Hereinafter,in the first partition plate 1, part thereof under the first slit 11(part left without being cut) will be referred to as an under-slit part12. In FIG. 4 , the under-slit part 12 is surrounded by a broken line.

The second partition plate 2, as seen from a plate-thickness directionthereof, has a structure shown in FIG. 5 . The second partition plate 2has a second slit 21 cut therein from a lower end thereof (i.e., an endthereof on the other side in the up-down direction). The second slit 21penetrates the second partition plate 2 in the plate-thickness directionof the second partition plate 2. The second slit 21 extends upward fromthe lower end of the second partition plate 2. However, the second slit21 does not reach an upper end of the second partition plate 2.

Hereinafter, in the second partition plate 2, part thereof over thesecond slit 21 (part left without being cut) will be referred to as anover-slit part 22. In FIG. 5 , the over-slit part 22 is surrounded by abroken line.

The first partition plate 1 and the second partition plate 2 aredisposed to intersect with each other as seen from the up-down direction(see FIG. 2 ). For example, the first partition plate 1 and the secondpartition plate 2 are orthogonal to each other as seen from the up-downdirection. In other words, the plate-thickness directions of the firstpartition plate 1 and the second partition plate 2 are orthogonal toeach other.

As will be later described in detail, when disposed in the containingarea CA, the first partition plate 1 has its plate-thickness directionparallel to the left-right direction (the direction X), while the secondpartition plate 2 has its plate-thickness direction parallel to thefront-back direction (the direction Y). In other words, when disposed inthe containing area CA, as seen from the up-down direction, the firstpartition plate 1 extends straight in the front-back direction (thedirection Y), and the second partition plate 2 extends straight in theleft-right direction (the direction X).

For intersection of the first partition plate 1 with the secondpartition plate 2, the first partition plate 1 has the first slit 11formed therein. And, the second partition plate 2 is inserted in thefirst slit 11 to thereby couple the first partition plate 1 and thesecond partition plate 2 to each other in an (orthogonally) intersectingmanner.

Specifically, the over-slit part 22 of the second partition plate 2 isinserted into the first slit 11. Further, the under-slit part 12 of thefirst partition plate 1 is inserted into the second slit 21. The secondslit 21 is formed in such part of the second partition plate 2 as is tobe inserted into the first slit 11. In other words, the second slit 21is formed in the second partition plate 2 in part thereof at which thesecond partition plate 2 intersects the first partition plate 1. Thefirst partition plate 1 holds the second partition plate 2 (theover-slit part 22) between a one-side cut surface 111 and an other-sidecut surface 112 in the first slit 11 that face each other.

The second partition plate 2 holds the first partition plate 1 (theunder-slit part 12) between a pair of inside surfaces (for which signsare omitted) in the second slit 21 that face each other.

Note that the first partition plate 1 and the second partition plate 2each erect (stand) in the up-down direction. The first partition plate 1is disposed such that a cutout opening of the first slit 11 (in otherwords, an opening allowing communication between inside and outside ofthe first slit 11) faces upward. The second partition plate 2 isdisposed such that a cutout opening of the second slit 21 (in otherwords, an opening allowing communication between inside and outside ofthe second slit 21) faces downward. In this case, into the first slit 11of the first partition plate 1, the second partition plate 2 is insertedfrom above (see FIG. 6 ). Thereby, the over-slit part 22 of the secondpartition plate 2 is disposed in the first slit 11 of the firstpartition plate 1, and the under-slit part 12 of the first partitionplate 1 is disposed in the second slit 21 of the second partition plate2.

By forming the first slit 11 in the first partition plate 1 and furtherforming the second slit 21 in the second partition plate 2, it ispossible to align positions of lower ends of the first partition plate 1and the second partition plate 2. Thereby, it is possible to suppressformation of a gap under the second partition plate 2 (between the lowerend of the second partition plate 2 and a bottom surface of thecontaining area CA).

Further, by forming the first slit 11 in the first partition plate 1 andforming the second slit 21 in the second partition plate 2 as well, itis possible to align positions of upper ends of the first partitionplate 1 and the second partition plate 2. Thereby, it is possible tosuppress protrusion of the upper end of the second partition plate 2beyond the upper end of the first partition plate 1.

Note that, as long as the first slit 11 is formed in the first partitionplate 1, even without forming the second slit 21 in the second partitionplate 2, it is possible to have the first partition plate 1 and thesecond partition plate 2 intersect with each other.

As a modified example, the first partition plate 1 may be disposed suchthat the cutout opening of the first slit 11 faces downward. In theconfiguration of this modified example, in a case where the secondpartition plate 2 has the second slit 21 formed therein, the secondpartition plate 2 is disposed such that the cutout opening of the secondslit 21 faces upward. In other words, there is no particular limitationto positional relationship between the first partition plate 1 and thesecond partition plate 2 in the up-down direction.

Here, the first partition plate 1 has an engagement protrusion 110 onthe one-side cut surface 111 of the first slit 11 (see FIG. 4 ).Specifically, in the one-side cut surface 111, as the engagementprotrusion 110, a protrusion is formed to protrude toward the other-sidecut surface 112. That is, the one-side cut surface 111 has theengagement protrusion 110 protruding toward the other-side cut surface112.

Further, the second partition plate 2 has an engagement hole 210 in theover-slit part 22 (i.e., over the second slit 21) (see FIG. 5 ).Specifically, in the over-slit part 22, as the engagement hole 210, athrough hole is formed to penetrate the second partition plate 2 in theplate-thickness direction thereof. In other words, the engagement hole210 is formed in such part of the second partition plate 2 as issandwiched between the one-side cut surface 111 and the other-side cutsurface 112 of the first slit 11.

And, as shown in FIG. 7 , with the over-slit part 22 of the secondpartition plate 2 inserted in the first slit 11, the engagementprotrusion 110 is inserted into the engagement hole 210. In other words,with the over-slit part 22 of the second partition plate 2 inserted inthe first slit 11, the engagement protrusion 110 and the engagement hole210 engage with each other. Thereby, the first partition plate 1 and thesecond partition plate 2 are engaged (i.e., coupled) with each other.Note that FIG. 7 shows a sectional view of the over-slit part 22 of thesecond partition plate 2 cut along a YZ plane.

In the configuration where the engagement protrusion 110 and theengagement hole 210 engage with each other, the second partition plate 2cannot move upward with respect to the first partition plate 1, becauseupward movement of the second partition plate 2 is restricted. In otherwords, the second partition plate 2 is unlikely to be uncoupled from thefirst partition plate 1. In still other words, the positionalrelationship between the first partition plate 1 and the secondpartition plate 2 in the up-down direction is unlikely to be distorted.Thereby, it is possible to suppress positional deviation of the firstpartition plate 1 and the second partition plate 2. As a result, it ispossible to suppress movement of a packaged object contained in thecontaining area CA. If the movement of the packaged object in thecontaining area CA can be suppressed, it is possible to suppress damageto the packaged object.

Further, the first partition plate 1 has a recessed portion 120 formedin the other-side cut surface 112 of the first slit 11 (see FIG. 4 ).The recessed portion 120 is, as seen from the plate-thickness directionof the first partition plate 1, recessed from other parts of theother-side cut surface 112 in a protruding direction of the engagementprotrusion 110. And, the engagement protrusion 110, as seen from theplate-thickness direction of the first partition plate 1, protrudes intothe recessed portion 120. That is, as seen from the plate-thicknessdirection of the first partition plate 1, at least part of theengagement protrusion 110 is disposed in the recessed portion 120. Inthis case, as seen from the plate-thickness direction of the firstpartition plate 1, part of the first slit 11 is constituted of a gapbetween the engagement protrusion 110 and the recessed portion 120.Thus, the first slit 11 is not linear as seen from the plate-thicknessdirection of the first partition plate 1. On the other hand, the secondslit 21 extends linearly as seen from the plate-thickness direction ofthe second partition plate 2.

In the configuration in which the engagement protrusion 110 of the firstpartition plate 1 protrudes into the recessed portion 120, with thesecond partition plate 2 inserted in the first slit 11 (a state shown inFIG. 7 ), the engagement protrusion 110 and the engagement hole 210 arein a strong engagement with each other, and thus it is possible tosuppress disengagement of the engagement protrusion 110 from theengagement hole 210. Thereby, it is possible to securely maintain astate in which the engagement protrusion 110 is inserted in theengagement hole 210 (in other words, a state where the engagementprotrusion 110 and the engagement hole 210 are engaged with each other).By maintaining the engagement protrusion 110 in the state of beinginserted in the engagement hole 210, it is possible to suppresspositional deviation of the first partition plate 1 and the secondpartition plate 2.

<Configuration of Packaging Box>

The packaging box 3 integrally has the first partition plate 1 and thesecond partition plate 2. In other words, the first partition plate 1and the second partition plate 2 are each part of the cardboard sheet100S (see FIG. 8 ). In still other words, in a process of folding thecardboard sheet 100S, the first partition plate 1 and the secondpartition plate 2 are disposed in the containing area CA in a state ofintersecting with each other.

The packaging box 3 includes a bottom portion 30. The packaging box 3further includes a pair of first wall portions 31 opposed to each otherin the left-right direction and a pair of second wall portions 32opposed to each other in the front-back direction.

The bottom portion 30 has a rectangular shape as seen from the up-downdirection. The bottom portion 30 may be oblong, or may be square, asseen from the up-down direction. The bottom portion 30 has, as seen fromthe up-down direction, a pair of edges that extend in the left-rightdirection and a pair of edges that extend in the front-back direction.

The pair of first wall portions 31 are respectively parts folded upwardfrom the pair of edges of the bottom portion 30 extending in thefront-back direction. In other words, the pair of first wall portions 31are parts that are respectively connected to the pair of edges of thebottom portion 30 extending in the front-back direction, and thatrespectively extend upward from the pair of edges of the bottom portion30 extending in the front-back direction.

The pair of second wall portions 32 are parts that are respectivelyfolded upward from the pair of edges of the bottom portion 30 extendingin the left-right direction. In other words, the pair of second wallportions 32 are parts that are respectively connected to the pair ofedges of the bottom portion 30 extending in the left-right direction,and that respectively extend upward from the pair of edges of the bottomportion 30 extending in the left-right direction.

An area over the bottom portion 30 is surrounded by the pair of firstwall portions 31 and the pair of second wall portions 32. The containingarea CA is an area that is over the bottom portion 30 and that issurrounded by the pair of first wall portions 31 and the pair of secondwall portions 32. An upper surface of the bottom portion 30 correspondsto a bottom surface of the containing area CA. A pair of mutually facingsurfaces of the pair of first wall portions 31 respectively correspondto internal surfaces that define a range of the containing area CA inthe left-right direction. A pair of mutually facing surfaces of the pairof second wall portions 32 respectively correspond to internal surfacesthat define a range of the containing area CA in the front-backdirection.

The packaging box 3 further includes a pair of lid portions 33. Partsextending from upper ends of the pair of second wall portions 32respectively correspond to the lid portions 33. That is, the lidportions 33 are respectively connected to the upper ends of the pair ofsecond wall portions 32. The pair of lid portions 33 are respectivelyfolded from the upper ends of the second wall portions 32, to which theyare connected, to thereby close the containing area CA from above.

For example, the lid portions 33 have operation portions 330. Theoperation portions 330 are cutouts formed in the lid portions 33. Toopen and close the lid portions 33, an operator puts one of his/herfingers in each of the operation portions 330.

Note that the packaging member 100 includes coupling portions 4. Thecoupling portions 4 are folded in the left-right direction from sideedges of the first wall portions 31 in the front-back direction, and areextended along the internal surfaces of the second wall portions 32. Thecoupling portions 4 are respectively connected to one and the other ofthe side edges of the first wall portions in the front-back direction.Furthermore, the coupling portions 4 are respectively connected to thepair of first wall portions 31.

Here, the first partition plate 1 is a part that is folded in thefront-back direction from one side edge of one of the coupling portions4 opposite the other side edge thereof connected to one of the firstwall portions 31 so as to be disposed in the containing area CA (seeFIG. 2 ). The second partition plate 2 is a part that is folded downwardfrom one edge of one of the lid portions 33 opposite another edgethereof connected to one of the second wall portions 32 so as to bedisposed in the containing area CA (see FIG. 6 ). In other words, thefirst partition plate 1 is a part that continuously extends from one ofthe first wall portions 31 via one of the coupling portions 4, and thesecond partition plate 2 is a part that continuously extends from one ofthe second wall portions 32 via one of the lid portions 33. In stillother words, the first partition plate 1 and the second partition plate2 are integrally provided in the packaging box 3.

In the configuration where the first partition plate 1 and the secondpartition plate 2 are integrally provided in the packaging box 3, it ispossible to reduce the number of components of the packaging member 100.In other words, merely by preparing one sheet of the cardboard sheet100S as shown in FIG. 8 , it is possible to obtain the packaging box 3having the first partition plate 1 and the second partition plate 2.

As a modified example, a part that is folded in the front-back directionfrom one side edge of one of the coupling portions 4 opposite the otherside edge thereof connected to one of the first wall portions 31 so asto be disposed in the containing area CA may be a second partition plate2, and a part that is folded downward from one edge of one of the lidportions 33 opposite another edge thereof connected to one of the secondwall portions 32 so as to be disposed in the containing area CA may be afirst partition plate 1.

Further, a first partition plate 1 connected via one of the couplingportions 4 to one side edge of one of the first walls 31 in thefront-back direction and a first partition plate 1 connected via one ofthe coupling portions 4 to the other side edge of one of the first walls31 that is opposite the one side edge in the front-back direction arefolded in opposite directions. That is, as seen from the up-downdirection, there exist a first partition plate 1 that extends from theone side to the other side in the front-back direction and a firstpartition plate 1 that extends from the other side to the one side inthe front-back direction.

And, in this configuration, such one of the coupling portions 4 as isconnected to one side edge of one of the first wall portions 31 in thefront-back direction and such one of the coupling portions 4 as isconnected to the other side edge of the one of the first wall portions31 in the front-back direction are different from each other in lengthin the left-right direction. That is, there exist first couplingportions 41 that are short in the left-right direction and secondcoupling portions 42 that are longer in the left-right direction thanthe first coupling portions 41 (see FIG. 2 ). Thereby, a state isreached in which, as seen from the up-down direction, four firstpartition plates 1 extending in the front-back direction are disposed atintervals in the left-right direction (the plate-thickness direction ofthe first partition plates 1). In this case, the containing area CA isdivided into five in the left-right direction.

That is, the packaging member 100 includes a plurality of firstpartition plates 1. The plurality of first partition plates 1 arecoupled to side edges of the pair of first wall portions 31 via thecoupling portions 4. Specifically, the plurality of first partitionplates 1 include those each coupled to one side edge of one of the firstwall portions 31 via one of the coupling portions 4 and those eachcoupled to the other side edge of one of the first wall portions 31 viaanother one of the coupling portions 4.

And, the plurality of first partition plates 1 are folded alongpredetermined fold lines. In other words, each of the plurality of firstpartition plates 1 is folded at a border line (the border line being apredetermined fold line) with respect to a corresponding one of thecoupling portions 4 to which it is coupled. As a result, the pluralityof first partition plates 1 are arrayed on the bottom portion 30 atintervals from one another in the left-right direction.

The packaging member 100 includes a pair of second partition plates 2coupled to the pair of lid portions 33. The pair of second partitionplates 2 include a plurality of second slits 21. The plurality of secondslits 21 correspond to the first slits 11 of the plurality of firstpartition plates 1. The pair of second partition plates 2 are foldeddownward from edges of the pair of lid portions 33, and the plurality ofsecond slits 21 are inserted into the first slits 11 of the plurality offirst partition plates 1, whereby the pair of second partition plates 2are coupled to the plurality of first partition plates 1.

Specifically, a part that is folded downward from an edge of one of thelid portions 33 opposite an edge connected to one of the second wallportions 32 so as to be disposed in the containing area CA and a partthat is folded downward from an edge of the other of the lid portions 33opposite to an edge connected to the other of the second wall portions32 so as to be disposed in the containing area CA form the secondpartition plates 2, which overlap each other in the front-back directionto form a duplicate portion (see FIGS. 2 and 6 ). That is, the twosecond partition plates 2 are overlapped with each other in thefront-back direction (the plate-thickness direction of the secondpartition plates 2). And, with the pair of second partition plates 2overlapping each other in the front-back direction, the plurality ofsecond slits 21 are inserted into the first slits 11 of the plurality offirst partition plates 1. Thereby, a state is reached in which theduplicate portion stands in the containing area CA, and this helpsenhance compressive strength of the packaging member 100 in the up-downdirection.

Note that, in this configuration, the four first partition plates 1divide the containing area CA into five in the left-right direction.And, by using the two second partition plates 2 as one partition plateformed by overlapping them in the front-back direction (theplate-thickness direction of the second partition plates 2), thecontaining area CA is divided into two in the front-back direction. Thatis, the first partition plates 1 and the second partition plates 2divide the containing area CA into ten areas.

<Assembly of Packaging Member>

A development view of the packaging member 100 is shown in FIG. 8 . Anintermediate state during assembly is shown in FIG. 9 . In FIGS. 8 and 9, the upper surface of the bottom portion 30 (the upper surface being aplacement surface on which to place a packaged object and also being thebottom surface of the containing area CA) is illustrated as facingupward. Further, in FIGS. 8 and 9 , a thick solid line is a cuttingline, and a broken line is a valley folding line.

A procedure of assembling the packaging member 100 starts with foldingthe first wall portions 31 and parts continuously extending from thefirst wall portions 31. Note that the parts include the couplingportions 4 and the first partition plates 1. Thereby, the state shown inFIG. 9 is reached from the state shown in FIG. 8 . That is, the state isreached in which the first partition plates 1 are erected.

Next, the second wall portions 32 and parts continuously extending fromthe second wall portions 32 are folded. Note that the parts include thelid portions 33 and the second partition plates 2. When folding thesecond partition plates 2 with respect to the lid portions 33, as shownin FIG. 6 , the second partition plates 2 are inserted into the firstslits 11 of the first partition plates 1, and the first partition plates1 are inserted into the second slits 21 of the second partition plates2. Thereby, the packaging member 100 shown in FIG. 1 is obtained.

By inserting the second partition plates 2 into the first slits 11 ofthe first partition plates 1, the engagement protrusion 110 is insertedinto the engagement hole 210. In other words, the engagement protrusion110 and the engagement hole 210 engage with each other. Note that thelid portions 33 are continuous with the second partition plates 2. Thus,by the engagement protrusion 110 and the engagement hole 210 engagingwith each other, the lid portions 33 are brought into the locked state(the lid portions 33 become unlikely to be opened). Thereby, accidentalopening of the lid portions 33 can be suppressed. To open the lidportions 33, it is necessary to release the engagement between theengagement protrusion 110 and the engagement hole 210 by intention.

Here, the two second partition plates 2 overlap each other in thefront-back direction (the plate-thickness direction of the secondpartition plates 2). In other words, the two second partition plates 2face each other with an extremely short interval therebetween in thefront-back direction. The interval between the two second partitionplates 2 in the front-back direction is smaller than a width of thesecond partition plates 2 in the up-down direction. Note that the twosecond partition plates 2 may be in contact with each other in thefront-back direction. With this configuration, when one of the pair oflid portions 33 is not opened, it is difficult to open the other of thelid portions 33.

To deal with this inconvenience, one of the two second partition plates2 has the engagement hole 210 formed therein, while the other secondpartition plate 2 has no engagement hole 210 formed therein. In otherwords, one of the second partition plates 2 engages with the firstpartition plates 1 while the other of the second partition plates 2 doesnot engage with the first partition plates 1. With this configuration,one of the lid portions 33 can be locked, but the other of the lidportions 33 cannot be locked. However, with one of the lid portions 33locked, the other of the lid portions 33 does not open. That is, withone of the lid portions 33 locked, the other of the lid portions 33 isalso substantially locked. Thus, with the configuration where only oneof the two second partition plates 2 has an engagement hole 210 formedtherein, it is possible to lock both of the pair of lid portions 33.

It should be understood that the embodiment disclosed herein is anexample in all aspects and does not limit the implementation of thepresent invention in any way. The range of the present disclosure isshown not by the above descriptions of the embodiment but the scope ofclaims for patent, and it is intended that all modifications within themeaning and range equivalent to the scope of claims for patent areincluded.

For example, the above embodiment has dealt with a case where the firstpartition plates 1 and the second partition plates 2 are integral withthe packaging box 3, but this is not meant to limit the presentdisclosure, and the first partition plates 1 and the second partitionplates 2 may be separate from the packaging box 3. That is, as shown inFIG. 10 , after assembling the packaging box 3 first, the firstpartition plates 1 and the second partition plates 2 may be put in thecontaining area CA of the packaging box 3. Note that FIG. 10 includes anupper diagram showing a state in which partition plates P (the firstpartition plates 1 and the second partition plates 2) are not disposedin the containing area CA of the packaging box 3, and a lower diagramshowing a state in which the partition plates P are disposed in thecontaining area CA of the packaging box 3.

Further, there is no particular limitation to the number of the firstand second partition plates 1 and 2 constituting the partition plates P.For example, as shown in FIG. 10 , two first partition plates 1 and onesecond partition plate 2 may be used. In that case, the containing areaCA can be divided into six areas.

What is claimed is:
 1. A packaging member, comprising: a first partitionplate that is disposed in a containing area for containing a packagedobject, and that extends in a first direction; and a second partitionplate that is disposed in the containing area, and that extends in asecond direction orthogonal to the first direction, wherein the firstpartition plate has a first slit cut therein from an end thereof on oneside in an up-down direction, the second partition plate has a secondslit cut therein from an end thereof on an other side in the up-downdirection, the second slit is inserted into the first slit to therebycouple the first partition plate and the second partition plate to eachother in an intersecting manner, the first slit includes a one-side cutsurface and an other-side cut surface that face each other, the one-sidecut surface has an engagement protrusion protruding toward theother-side cut surface, the second partition plate has an engagementhole formed therein over the second slit, the engagement holepenetrating the second partition plate in a plate thickness directionthereof, and with the second partition plate inserted in the first slit,the engagement protrusion is inserted into the engagement hole tothereby couple the first partition plate and the second partition plateto each other.
 2. The packaging member according to claim 1, wherein theother-side cut surface has a recessed portion that is recessed in aprotrusion direction of the engagement protrusion, and the engagementprotrusion protrudes into the recessed portion.
 3. The packaging memberaccording to claim 1, further comprising: a bottom portion that has arectangular shape; a pair of first wall portions that are folded upwardfrom a pair of edges of the bottom portion that extend in the firstdirection; a pair of second wall portions that are folded upward from apair of edges of the bottom portion that extend in the second direction,the containing area being an area that is over the bottom portion andthat is surrounded by the first wall portions and the second wallportions; and a pair of lid portions that are portions extending fromupper ends of the pair of second wall portions, and that are folded fromthe upper ends of the second wall portions to thereby close thecontaining area from above, wherein the first partition plate includes aplurality of first partition plates, the plurality of first partitionplates are coupled to side edges of the pair of first wall portions viacoupling portions, and are folded along predetermined fold lines tothereby be arrayed on the bottom portion in the second direction, thesecond partition plate includes a pair of second partition plates thatare coupled to the pair of lid portions, the pair of second partitionplates have a plurality of the second slits, the plurality of the secondslits each correspond to the first slit of one of the plurality of firstpartition plates, and the pair of second partition plates are foldeddownward from edges of the pair of lid portions, and the plurality ofthe second slits are each inserted into the first slit of one of theplurality of first partition plates to thereby couple the pair of secondpartition plates to the plurality of first partition plates.
 4. Thepackaging member according to claim 3, wherein such one of the couplingportions as is connected to one of the side edges of the pair of firstwall portions that is located on one side in the first direction andsuch one of the coupling portions as is connected to one of the sideedges of the pair of first wall portions that is located on an otherside in the first direction are different from each other in length inthe second direction.
 5. The packaging member according to claim 3,wherein with the pair of second partition plates overlapping each otherin the first direction, the plurality of the second slits are eachinserted into the first slit of one of the plurality of first partitionplates.